Ion exchange chromatography separates components primarily by which property?

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Multiple Choice

Ion exchange chromatography separates components primarily by which property?

Ion exchange chromatography relies on ionic interactions between the analytes and fixed charges on the resin. At a given pH, molecules that carry a net positive or net negative charge are attracted to oppositely charged sites on the stationary phase, causing them to bind. Neutral species don’t bind strongly and elute with the solvent, while charged ones are retained to varying extents depending on their charge magnitude and the solution conditions. Elution is achieved by increasing salt concentration or changing pH to disrupt these electrostatic interactions. This mechanism emphasizes charge differences, rather than solubility, molecular size, or polarity, which govern other chromatographic approaches.

Ion exchange chromatography relies on ionic interactions between the analytes and fixed charges on the resin. At a given pH, molecules that carry a net positive or net negative charge are attracted to oppositely charged sites on the stationary phase, causing them to bind. Neutral species don’t bind strongly and elute with the solvent, while charged ones are retained to varying extents depending on their charge magnitude and the solution conditions. Elution is achieved by increasing salt concentration or changing pH to disrupt these electrostatic interactions. This mechanism emphasizes charge differences, rather than solubility, molecular size, or polarity, which govern other chromatographic approaches.

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